senator dianne feinstein joins fellow democrats bruising the bill which would ban the purchase of semi automatic weapons with detaching magazine clips and also high capacity magazine. this president vowed to make gun control a priority in his second term of the newtown connecticut massacre. >> still, the bill does face a tough fight in congress and from the nra. and of of president obama's gun control proposals, analysts say this is the least likely to pass. shawn unanimous with the reasons for that. how confident are lawmakers behind the proposal? >> well, shep, senator feinstein and the other senate and house members who joined here repeatedly said they know this is going to be tough but they believe the newtown tragedy has changed the conversation and the pressure for capitol hill to get something done. here's a bit of what senator feinstein had to say. >> gun laws allow these mass killings to be carried out again and again and again in our country. weapons designed originally for the military, to kill large numbers of people in close combat, are replicated for civilian use. >> the